The third stage is the formal testing.

第三个阶段是形成正式问卷后施测。

youdao

No formal testing has been performed by the IBM development laboratory.

IBM开发实验室没有执行任何正式的测试。

youdao

Products must go through formal testing, so you can rest assured that use.

产品都要经过正规检测，所以可以放心使用。

youdao

While I didn't do any formal testing, I could almost see the meter run down using internet radio -- a quarter of the reported capacity disappeared in three hours.

ENGADGET: Switched On: Music in the air (Part 2)

The external auditor uses inquiry and actual testing of transactions to develop a formal opinion on the financial statements.

FORBES: Crisis? What Crisis? Don't Blame The Accounting

Facebook says it was "testing" the feature and that it had not become a formal part of the site, despite the fact that it was available online on Monday.

CNN: Facebook pulls location-tracking feature